/*
 * @(#)XMLNode.java 1.6 05/11/17 Copyright (c) 2006 Sun Microsystems, Inc. All
 * Rights Reserved. Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following conditions
 * are met: -Redistribution of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer. -Redistribution
 * in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. Neither the name of Sun
 * Microsystems, Inc. or the names of contributors may be used to endorse or
 * promote products derived from this software without specific prior written
 * permission. This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC.
 * ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. You
 * acknowledge that this software is not designed, licensed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

package jnlp.sample.servlet;

import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * Class that contains information about an XML Node
 */
public class XMLNode
{
    private boolean _isElement; // Element/PCTEXT

    private String _name;

    private XMLAttribute _attr;

    private XMLNode _parent; // Parent Node

    private XMLNode _nested; // Nested XML tags

    private XMLNode _next; // Following XML tag on the same level

    /** Creates a PCTEXT node */
    public XMLNode(String name)
    {
	this(name, null, null, null);
	_isElement = false;
    }

    /** Creates a ELEMENT node */
    public XMLNode(String name, XMLAttribute attr)
    {
	this(name, attr, null, null);
    }

    /** Creates a ELEMENT node */
    public XMLNode(String name, XMLAttribute attr, XMLNode nested, XMLNode next)
    {
	_isElement = true;
	_name = name;
	_attr = attr;
	_nested = nested;
	_next = next;
	_parent = null;
    }

    public String getName()
    {
	return _name;
    }

    public XMLAttribute getAttributes()
    {
	return _attr;
    }

    public XMLNode getNested()
    {
	return _nested;
    }

    public XMLNode getNext()
    {
	return _next;
    }

    public boolean isElement()
    {
	return _isElement;
    }

    public void setParent(XMLNode parent)
    {
	_parent = parent;
    }

    public XMLNode getParent()
    {
	return _parent;
    }

    public void setNext(XMLNode next)
    {
	_next = next;
    }

    public void setNested(XMLNode nested)
    {
	_nested = nested;
    }

    public boolean equals(Object o)
    {
	if (o == null || !(o instanceof XMLNode))
	    return false;
	XMLNode other = (XMLNode) o;
	boolean result = match(_name, other._name) && match(_attr, other._attr)
		&& match(_nested, other._nested) && match(_next, other._next);
	return result;
    }

    public String getAttribute(String name)
    {
	XMLAttribute cur = _attr;
	while (cur != null)
	{
	    if (name.equals(cur.getName()))
		return cur.getValue();
	    cur = cur.getNext();
	}
	return "";
    }

    private static boolean match(Object o1, Object o2)
    {
	if (o1 == null)
	    return (o2 == null);
	return o1.equals(o2);
    }

    public void printToStream(PrintWriter out)
    {
	printToStream(out, 0);
    }

    public void printToStream(PrintWriter out, int n)
    {
	if (!isElement())
	{
	    out.print(_name);
	}
	else
	{
	    if (_nested == null)
	    {
		String attrString = (_attr == null) ? "" : (" " + _attr.toString());
		lineln(out, n, "<" + _name + attrString + "/>");
	    }
	    else
	    {
		String attrString = (_attr == null) ? "" : (" " + _attr.toString());
		lineln(out, n, "<" + _name + attrString + ">");
		_nested.printToStream(out, n + 1);
		if (_nested.isElement())
		{
		    lineln(out, n, "</" + _name + ">");
		}
		else
		{
		    out.print("</" + _name + ">");
		}
	    }
	}
	if (_next != null)
	{
	    _next.printToStream(out, n);
	}
    }

    private static void lineln(PrintWriter out, int indent, String s)
    {
	out.println("");
	for (int i = 0; i < indent; i++)
	{
	    out.print("  ");
	}
	out.print(s);
    }

    public String toString()
    {
	StringWriter sw = new StringWriter(1000);
	PrintWriter pw = new PrintWriter(sw);
	printToStream(pw);
	pw.close();
	return sw.toString();
    }
}
